Subject: problem from fibonacci's liber abaci

A merchand doing business is Lucca doubled his money there and spent 12 denarii. On leaving, he went to Florence, where he also doubled his mone and spent 12 denarii. Returning home to Pisa, he there doubled his money and again spent 12 denarii, nothing remaining. How much did he have in the beginning?


Start from the end and work backwards. How much did he have when he arrived in in Pisa?

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